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Interest income (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of Interest Income [Abstract]  
Disclosure of Interest Income
    
Year ended December 31,
 
    
2019
    
2020
    
2021
 
    
NT$000
    
NT$000
    
NT$000
 
Bank deposits
     59,901        25,547        8,772  
Financial assets at amortized cost
     4,467        2,206        1,187  
Other interest income
     —          25        21  
    
 
 
    
 
 
    
 
 
 
    
 
64,368
 
  
 
27,778
 
  
 
9,980